diff --git a/equinox-fc/Domain/LocationEpoch.fs b/equinox-fc/Domain/LocationEpoch.fs
index e2f41d27f..e5c0f571d 100644
--- a/equinox-fc/Domain/LocationEpoch.fs
+++ b/equinox-fc/Domain/LocationEpoch.fs
@@ -4,6 +4,11 @@ module Location.Epoch
 [<RequireQualifiedAccess>]
 module Events =
 
+    let [<Literal>] category = "LocationEpoch"
+    let (|For|) (locationId, epochId) =
+        let id = sprintf "%s_%s" (LocationId.toString locationId) (LocationEpochId.toString epochId)
+        Equinox.AggregateId (category, id)
+
     type CarriedForward = { initial : int }
     type Delta = { value : int }
     type Event =
@@ -12,10 +17,6 @@ module Events =
         | Delta of Delta
         interface TypeShape.UnionContract.IUnionContract
     let codec = FsCodec.NewtonsoftJson.Codec.Create<Event>()
-    let [<Literal>] category = "LocationEpoch"
-    let (|For|) (locationId, epochId) =
-        let id = sprintf "%s_%s" (LocationId.toString locationId) (LocationEpochId.toString epochId)
-        Equinox.AggregateId(category, id)
 
 module Fold =
 
diff --git a/equinox-fc/Domain/LocationSeries.fs b/equinox-fc/Domain/LocationSeries.fs
index 7c7d1e6c8..d1ff8972e 100644
--- a/equinox-fc/Domain/LocationSeries.fs
+++ b/equinox-fc/Domain/LocationSeries.fs
@@ -4,19 +4,20 @@ module Location.Series
 [<RequireQualifiedAccess>]
 module Events =
 
+    let [<Literal>] category = "LocationSeries"
+    let (|For|) id = Equinox.AggregateId (category, LocationId.toString id)
+
     type Started = { epochId : LocationEpochId }
     type Event =
         | Started of Started
         interface TypeShape.UnionContract.IUnionContract
     let codec = FsCodec.NewtonsoftJson.Codec.Create<Event>()
-    let [<Literal>] category = "LocationSeries"
-    let (|For|) id = Equinox.AggregateId(category, LocationId.toString id)
 
 module Fold =
 
     type State = LocationEpochId
     let initial = LocationEpochId.parse -1
-    let evolve _state = function
+    let private evolve _state = function
         | Events.Started e -> e.epochId
     let fold = Seq.fold evolve